Patents by Inventor Valentina A. Demidova

Valentina A. Demidova has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • .alpha.,.alpha.-azo-bis-isobutyric acid .alpha.,.omega.-bis alkyl ester derivatives and method for preparing same
    Patent number: 4290945
    Abstract: Novel compounds according to the present invention, i.e. derivatives of .alpha.,.omega.-bis-alkyl esters of isobutyric acid having the formula: ##STR1## A method for preparing the above-specified novel compounds consists in reacting .alpha.,.alpha.'-azo-bis-isobutyric acid dinitrile and a saturated alkyl monohydric alcohol derivative of the formula ROH, wherein R: ##STR2## with gaseous hydrogen chloride in an organic solvent medium in the presence of 0.5-5% by mass of a water-soluble ether at a temperature within the range of from -5.degree. to +6.degree. C., followed by treating the resulting reaction mixture with water at a temperature of from 0.degree. to -5.degree. C. and isolation of the desired product.The novel compounds according to the present invention are useful as initiators for a radical-type polymerization of ethylenically unsaturated compounds, as well as the starting products for the manufacture of reactive polymers by a simplified process.
    Type: Grant
    Filed: November 6, 1979
    Date of Patent: September 22, 1981
    Inventors: Anatoly A. Syrov, Sergei S. Ivanchev, Oleg N. Primachenko, Valentina A. Demidova, Boris V. Polozov, Vladimir I. Fionov, Evgeny N. Barantsevich